I posted this on another topic, but here's my predictions for the next batch. Keep in mind it has to be 2 Passions, 2 Cutes, and 1 Cool.
Cool: Haruna, since she seems to be pretty popular.
Passion: Yumi and Takumi, since they won voices and everything. Natsuki probably won't be for a while, seeing as how Rockin' Emotion exists and all. Same for a Tamami solo; she has this random solo called Aozora Yell?
Cute: Noriko, since this imaginary batch is pretty adult-and-mature-character heavy. I literally can't see her not
having a really peppy song. Then... Maybe... Karin or Yuka? Unless Kyoko wins the voiced idol election, which is entirely possible...